Both GM’s Opel and Fiat Chrysler have become the targets of serious dieselgate accusations. The companies have been in the media for months. Last week, the matter became official, and both carmakers were held accountable by German regulators. Opel met with the Germans, and most likely will get away with a stern finger-wagging, industry experts agree. Fiat stood up officials in Berlin, and the book is being thrown at the Italian maker.